xwayland: Allow to retrieve _NET_STARTUP_ID
This is use for startup notifications per startup-notifiation spec
https://specifications.freedesktop.org/startup-notification-spec/startup-notification-latest.txt (cherry picked from commit de1522ae)
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This is use for startup notifications per startup-notifiation spec
https://specifications.freedesktop.org/startup-notification-spec/startup-notification-latest.txt (cherry picked from commit de1522ae)